Microphones in general, sometimes their sensitivity is increased by the reflection- and concentration principle realized in acoustic mirrors.

The Germans referred to a Schwerpunkt (focal point) and to a Schwerpunktprinzip (concentration principle) in the planning of operations.

Her aide, Miroslav Danek, responsible for structural funds in the ministry for regional development, explained: "They hired the best people, and followed the concentration principle, which is to go for big projects that make a difference instead of spreading the money around."